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Old 08-16-2010, 03:51 PM   #1
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pressure treated 2x4's


I just got my shipment of pressure treated 2x4's today for my basement project (bottom plate is PT) while stacking them in the garage, I noticed some are very light like a normal 2x4... but some are very heavy, almost like they are full of water... do these retain water if the lumbar yard stored them outside? should I let them sit indoors for a while before using them? I'm not getting to the wood construction for a week or so, would that be enough "drying" time to aclamate to the indoors?

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Old 08-16-2010, 04:22 PM   #2
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pressure treated 2x4's


Sounds like you received a mixed batch. The light ones have been around awhile and the heavy ones are new. It will take a few weeks for the heavy ones to dry out.
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Old 08-16-2010, 04:24 PM   #3
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pressure treated 2x4's


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Sounds like you received a mixed batch. The light ones have been around awhile and the heavy ones are new. It will take a few weeks for the heavy ones to dry out.
Ron

Is it ok to use them before they dry out? I'm just anchoring them to the concrete then framing on top of them
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Old 08-16-2010, 06:21 PM   #4
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pressure treated 2x4's


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Is it ok to use them before they dry out? I'm just anchoring them to the concrete then framing on top of them
Nobody ever waits for them to dry out. Best to secure them before they start to warp.
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Old 08-16-2010, 07:06 PM   #5
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pressure treated 2x4's


Use some sill sealer under each against capillary action and for a thermal break from the slab/wall. P.t. wood is not waterproof, unless you special ordered it as such. Nail tight to foam board on concrete, no gap to create convective loop behind the glass batt in the wall. Fire-code requires blocking every 10' laterally. http://www.greenbuildingadvisor.com/...-building-code

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Old 08-16-2010, 08:43 PM   #6
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pressure treated 2x4's


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Originally Posted by GBR in WA View Post
Use some sill sealer under each against capillary action and for a thermal break from the slab/wall. P.t. wood is not waterproof, unless you special ordered it as such. Nail tight to foam board on concrete, no gap to create convective loop behind the glass batt in the wall. Fire-code requires blocking every 10' laterally. http://www.greenbuildingadvisor.com/...-building-code

Be safe, Gary

Already got the sill gasket foam (the stuff on a roll the width of the 2x4 that is about a 8th of an inch thick I think?) ready for that when I get to it. thanks for the blocking tip, didn't have it in my plan
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Old 08-16-2010, 09:56 PM   #7
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pressure treated 2x4's


Use them as soon as you can, don't wait for them to dry out. As pt lumber dries, it can warp and twist DRAMATICALLY.
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Old 08-17-2010, 05:43 PM   #8
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pressure treated 2x4's


the local lumber yard rachet straps and hoses down the PT after hours to keep it from warping.

if it warps on you dramatically, you can probably take it back and get usable boards.

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